Which CPU for AVIDEMUX and where is the Setup for NVIDIA Graphics.

[Casiiopaia]

Hallo, i work with AVIDEMUX and Intel CPU. for the Moment I9-10900k.

Now i have install a AMD Ryzen 7-1700x with a new motherboard, and he works with the same speed such the Intel i9. Can it be? I think the AMD works slowlier, but he didnt.
Now i have a NVIDIA GTX680 CPU, and i read, that NVIDIA options are good for work with AVIDEMUX.
Where are the Points for SETUP the NVIDIA Graphic Card.
thanks